Mitsubishi Heavy Industries Error Codes

If faults are occurring on your Mitsubishi Heavy air conditioning system, it is very important to discover it quickly. Error codes are a great way to find out the initial problem. Error codes are usually displayed on your remote.

If you can’t find what you are looking for, give us a call on 02034881889 and we will be happy to help.

Mitsubishi Heavy Industries error codes:

E1Remote control communication error
E2Duplicate indoor unit address
E3Outdoor unit signal line error
E5Communication error during operation
E6Internal heat exchanger temperature thermistor abnormality (Thi-R)
E7Internal return air temperature thermistor abnormality (Thi-A)
E9Unloading problem
E10Excessive number of indoor units with remote control
E12Address setting error with mixed setting method
E16Internal fan motor abnormality (FDT series)
E16Internal fan motor abnormality (FDK series)
E19Indoor unit operation control unload motor control mode abnormality
E28Remote control temperature thermistor abnormality (ThC)
E30Incompatible connection of indoor and outdoor unit
E31Replicated outdoor unit address no.
E32Open L3 phase in the primary side power supply
E36Drain pipe temperature error (Tho-D1, D2)
E36Liquid overflow abnormality
E37Abnormalities of external heat exchanger temperature thermistor (Tho-R) and sub-cooling coil temperature thermistor (Tho-SC, -H)
E38Outdoor temperature thermistor abnormality (Tho-A)
E39Drain pipe temperature thermistor abnormality (Tho-D1, D2)
E40High pressure abnormality (63H1-1, 2 active)
E41 (E51)Power transistor overheating
E42Power failure (CM1, 2)
E43Over-connected indoor units, over-total capacity connection
E45Communication error between inverter PCB and external control PCB
E46Mixed address setting methods available on the same network
E48External DC fan motor abnormality
E49Low pressure abnormality
E53/E55Suction pipe temperature thermistor abnormality (Tho-S), Under-dome temperature thermistor abnormality (Tho-C1, C2)
E54High pressure sensor (TSH) Low pressure sensor (PSL) abnormality
E56Power transistor temperature thermistor abnormality (Tho-P1, Tho-P2)
E58Abnormal compressor with loss of synchronization
E59Compressor start failure (CM1, 2)
E60Rotor position detection failure (CM1, 2)
E61Communication error between main unit and backup units System error
E63Emergency stop

Mitsubishi Electric Error Codes

Mitsubishi electric air conditioning systems are very well known for their ultra-quite noise level as well as their higher savings on installation and running costs.

Looking to match your error codes. You have come to the right place!

If you are lost and want to get your air conditioning fixed quickly we are here to help. Don’t hesitate to call us on 02034881889 or email us on [email protected].

Mitsubishi Electric error codes:

City Multi

  • 403: Communications fault between boards – check the details of the inverter error to determine which boards are involved, and also check the transformer, bus voltage and any interconnecting cables
  • 900: The lossnay unit is in a test run
  • 1102: Compressor discharge temperature is too high, meaning it has exceeded 110C or more, and it may be short of refrigerant.
  • 1301: Low pressure fault – the pressure sensor has detected less than one bar of pressure before starting.

Mr Slim P Series (A)

  • A0: Green LED – 2 flashes, red LED – 5 flashes, controller 6600: Lossnay units are attached with the same address – simply change the addresses and reset the unit.
  • A2: Green LED – 2 flashes, red LED – 5 flashes, controller 6602: The transmission processor has encountered a hardware error – check communications wiring and for a fault on the lossnay board.
  • A6: Green LED – 2 flashes, red LED – 5 flashes, controller 6606: A communication error with the communication processor – check the M-Net voltage.
  • E0: Green LED – 2 flashes, red LED – 3 flashes:
  • Communication error with remote controller. Check the wiring, the voltage and connections. If multiple systems are connected, check the master/slave settings.

Mr Slim P Series (K)

  • EO: System transmission error – there could be a communications fault between the I/C and R/C
  • P4: Drain sensor fault – check the drain sensor resistance and connection
  • P5: Drain fault – high levels of condensate have been detected, so check for blockages in the drain, tray or pump failure
  • P7: System error – there is a fault with the address setting

Daikin Error Codes

Are you looking to repair your air-conditioning?

The Daikin error codes will help you fix your air-conditioning in no time. Similar to other devices, your Daikin air-conditioning will infrequently crash due to problem’s with some parts of the air conditioning system. In other cases it can be incorrect installation/settings.

Advantages of a Daikin unit are that they are pre-programmed and will display an error code that is relevant to the problem.  A great way to start fixing your air-conditioning is to match the error codes below.

All our engineers are fully qualified with high quality work. We offer great deals and services. We provide on day services for those in need. Don’t hesitate to give us a call today on 02034881889.

List of Daikin Air Conditioner error codes:

Error CodesProblem
UAIndoor-outdoor Unit Combination Fault
U0Refrigerant Shortage
U2Drop Voltage or main circuit overvoltage
U4Failure of transmission (Between indoor unit and outdoor unit)
A1Indoor Pcb Defectivenes
A5High Pressure Control Or Freeze-up Protector
A6Fan Motor Fault
C4Faulty Heat Exchanger Temperature Sensor
C9Faulty Suction Air Temperature Sensor
EACooling-heating Switching Error
E1Circuit Board Fault
E5OL Started
E6Faulty Compressor Start Up
E7DC Fan Motor Fault
F3High Temperature Discharge Pipe Control
F6High Pressure Control (In Cooling)
H0Sensor Fault
H6Operation Halt Due To Faulty Position Detection Sensor
H8DC Current Sensor Fault
H9Faulty Suction Air Temperature Sensor
J3Faulty Discharge Pipe Temperature Sensor
J6Faulty Heat Exchanger Temperature Sensor
L3Electrical Parts Heat Fault
L4High Temperature At Inverter Circuit Heatsink
L5Output Overcurrent
P4Faulty Inverter Circuit Heatsink Temperature Sensor


How to properly clean and maintain your air conditioning?

How to properly clean and maintain your air conditioning?

It is imperative to maintain your air conditioning system regularly. Not only do you optimize its efficiency but you also protect yourself from health problems that may arise from poor air quality. Moreover, by maintaining your HVAC equipment, you increase its lifespan, and decrease the likelihood of a system breakdown. The benefits of maintenance are many, and in this guide we’ll walk you on how to clean your air conditioner yourself, and further emphasize the importance of maintenance.

Clean your air conditioning

Ensuring the proper functioning of an air conditioning is to clean the air filters. This way, you eliminate dust and other particles that could be harmful to your health. The operation is to be carried out every 15 days (during the period of regular use).

Here are the steps to follow:
  1. Turn off and unplug the air conditioning.
  2. Open the trunk (the front of the device) by lifting the front panel.
  3. Remove the air filters from their base by unclipping them.
  4. Gently pat over a trash can.
  5. Remove dust lint by hand.
  6. Vacuum the grates with a narrow mouth vacuum.
  7. Use a sponge soaked in lukewarm water and regular soap.
  8. Rinse with clean water.
  9. Leave to air dry.
  10. Put the filters back in the air conditioning.

You can also replace the activated carbon filter yourself. This maintenance is carried out once or twice a year to fight against bad odors. If the filter is still in perfect condition, a simple cleaning might suffice.

To do this, you will first need to identify the activated carbon filters that may be located between the air filters and the mouths of the exhaust pipes. Press the retaining rivets to release the carbon filters. Put them in the dishwasher or simply clean them in lukewarm water, without using soap. Dry for 10 minutes in the oven at 100 ° C before returning to the air conditioning.

Also remember to clean the entire air conditioning:
  • Use a soft, lint-free cloth and rub the air conditioning body. Do the same for the different pipes.
  • Use a sponge soaked in water to clean the air outlets.
  • Clean the filters if they are clogged.
  • Empty the condensate tray and clean it.

Maintain your air conditioning regularly

Cleaning operations are within your reach, but more technical maintenance should be entrusted to competent professionals such as Be Cool Refrigeration.

Once a year or twice a year depending on your type of air conditioning, it is for example necessary to check the tightness of the refrigerant circuit. The HVAC technician must ensure that there are no leaks or suspicious noises. Also, a technician can check the entire system to make sure that there is no malfunction.

We strongly recommend that you sign a maintenance contract with a professional local HVAC company, and get regular checks to prevent breakdowns, and malfunctions. In the event of an emergency, you’ll be less anxious thanks to the contract in place.


Contact us to request your maintenance quote. We are also at your disposal for any repair, replacement or air conditioning installation.

Commercial Upkeep: Why Restaurants, Pubs, Shops and Hotels Should Invest in A Maintenance Plan

Commercial Upkeep: Why Restaurants, Pubs, Shops and Hotels Should Invest in A Maintenance Plan.

Domestic customers acknowledge the importance of planned maintenance, and often they choose to be proactive and invest in routine maintenance to “tune-up” their appliances and systems.

Businesses have just as much need for HVAC maintenance as residential customers, yet they choose to opt out of maintenance plans and agreements. Instead, they opt for repair services only upon breakdown.

This is really not the most beneficial scenario, since restaurants, pubs, and hotels serve produce which must be refrigerated. Therefore, their reputation is placed under threat, in the event they fail to deliver the expected quality.

If you own or manage a restaurant, consider this: you choose to repair only upon breakdown. Your HVAC system and commercial refrigeration has an issue which is costly to repair and results to loss of procedure. In such event, no refrigeration means meat, dairy and produce will begin to spoil, so you are forced to cook everything at once or limit your stock. Thus, you fail to provide the expected service and your customers become uncomfortable. They choose to leave your shop and look for an alternative place.

All the financial loss would be more than the cost of a maintenance plan for your HVAC system and refrigeration appliances in your restaurant. The benefits of maintenance plan include:

1- Routine inspections where issues are identified at an early point

2- Financial advantage

3- Avoidance of major breakdowns and costly penalties

So why not protect your restaurant, money, and customers. Give us a call about our maintenance plan and how it can work for your business. At Be Cool we operate a 24/7 service that strives to ensure your business is always running at its highest potential.

What’s Refrigeration?

What’s Refrigeration?

Industrial refrigeration and air-conditioning operate on the same principle: a fluid, generally water or air, is cooled by evaporation of another fluid, known as the refrigerant.

The main components of a refrigerant circuit are:

  • Evaporator:
  • Compressor
  • Condenser
  • Expansion device

Refrigeration is the process involving a drop in the temperature of fluids. Specifically, it’s used for temporary storage of perishable goods, at temperature down to -60 °C.

Refrigeration is one of the most important application in the food industry, as it slows down the growth of bacteria in produce, preserves organoleptic properties and extends shelf-life

The equipment utilised in the commercial refrigeration industry includes:

  • Cold rooms
  • Supermarket displays
  • Displays in patisseries, bar, ice cream
  • Refrigerators used in industrial kitchens and distribution centres
  • Refrigeration for pharmaceutical industry
  • Blast Chillers
  • Display freezers

The equipment will vary in design, shape and standard compliance i.e. the cooling performance required.

At Be Cool we offer a comprehensive and tailored service to fulfill your needs. We retain extensive experience and offer a wide range of equipment which we can advise on. For more information on single or multiple units please contact us!

Air Conditioning System Installation – Choosing Your Air Conditioning System

Air Conditioning System Installation – Choosing Your Air Conditioning System

The benefits of installing an inverter air conditioning unit extend from increased cooler capacity to energy efficiency. Its low energy consumption and low carbon emission in comparison to conventional methods, makes a very cost effective investment.

Though choosing the right system for your needs is not always easy. This why Be Cool aims to introduce the different systems available.


Split Systems – Wall-Mounted and Cassette

This is an ideal air conditioner for small businesses such as restaurants, pubs, and small local shops. It is also an attractive solution for commercial properties and small retail shops. The system can serve your space effectively and provide comfortable environment.

The system is relatively more cost effective in comparison to a Multi split or Central Systems. However, the system needs enough space outdoor for each indoor unit.

Multi Split

Multi Split or Central Systems

Multi split or central air conditioning systems are highly acquired in the commercial sector. Depending on the model acquired by the business, up to 9 indoor units can be connected to a single outdoor unit. This is ideal for businesses that are seeking a central control for multiple indoor units. This system is installed in restaurants, offices, and small centres.

This system provides a solution for medium businesses with a dependency on air conditioning for heating and cooling the premises. In addition, it is very attractive when the outdoor space is restricted.

VRF/ VRV Air Conditioning Systems

VRF and VRV air conditioning is the system recommended for large premises such as hotels, warehouses, large buildings, and centres. VRF (variable refrigerant flow) and VRV (variable refrigerant volume) mean the same thing. Daikin is this VRV technology original developer which is protected by the manufacturer. Thus, other companies refer to this system as VRF.

This is an ideal cost-effective solution for large developments. It can be used to heat and cool the place removing the need for boilers and inefficient conventional heating methods.

The system is very efficient and reliable. It allows for central control. However, the installation cost is high.



Top 5 things to consider when buying an Air Conditioning Unit

Top 5 things to consider when buying an Air Conditioning Unit



Air conditioners do vary in price depending on the specification required. A sophisticated system might cost more than a window-mounted air conditioner.

Though despite the initial investment you must consider the benefits of such systems. Air conditioning systems are accepted to have significant environmental and economic saving. Over time the system will justify itself as it will service its purpose, and consume less energy.


Large air condition systems are more efficient in servicing the purpose. But we should also consider the space we need to service – at Be Cool Refrigeration we will carry out detailed computation to determine the power required, ensuring energy is not wasted.

The power of an air conditioner is dependent on many factors though it can be assumed that you’ll require around 20 BTUs (British Thermal Units) per square foot. Other factors will need to be accounted for such as number of occupants, sunlight, and any other sources of heat.

Installation Distance

The performance of an air conditioning system is dependent on the length of tubing required. The longer the duct/ piping between the indoor and outdoor condenser unit the higher inefficiency.

Thus, the installation distance is mainly dependent on the physical makeup of the building. To maximise performance, you must seek to install the unit as close as possible or increase the power to account for the efficiency loss.

Health and Safety

Health and Safety in the working environment is key to employees’ wellbeing and is a legal requirement. The temperature in the room must be controlled and the benefit of an air condition system is it can be used for both cooling and heating. You may set your room temperature and the air conditioner will automatically accommodate this. However, to ensure the system is functioning to its maximum potential, you’ll need to service it regularly.


Air conditioners can be noisier than others. Generally speaking, this is because they’re less efficient and therefore the fan must work longer to service the required temperature. However modern Inverter systems will have low ‘dbA’ and therefore are adequate for commercial and domestic use.

Different Types of Refrigeration Systems

A cold room is essential to many industries, when small or even large refrigeration units don’t suffice, cold rooms provide you with the ideal solution. Especially if you need maximum storage capacity and have a business that deals with heaps of produce.

What Various Types of Cold Room Refrigeration Systems?

When seeking to install a Cold Room it is a necessity to understand the different type of cold room refrigeration systems and their feature in order to fulfill your business requirements. So the fundamental principle behind each system are:

Remote Refrigeration Systems – The evaporator unit is installed inside the walk in room, while the condenser unit is placed outside the building. The primary advantage of this system is that heat is discharged outside hence performance is maximised.

Top Mount Refrigeration Systems – This system is ideal for small to medium sized business such as restaurants or local stores. The design utilises the space in an efficient manner to maximise storage space. Moreover, this system is optimised to hold low temperature levels, even after long hours to preserve produce.    

Penthouse Refrigeration Systems – A Penthouse refrigeration systems are more expensive than a conventional system however it is certainly a cost-effective solution to protect produce. The system design offers optimum storage space and facilities maintenance.

Saddle Mount Refrigeration System – The systems are pre-assembled and is installed on top of the wall panel. on a bracket. The refrigeration system is to be installed by a qualified engineer.

For a free no obligation quote give us a call.   

F-Gas, What Do You Need to Know as a Client?

There is a growing concern in the level of awareness of operator F-Gas legislation. Thus, at Be Cool Refrigeration we feel it is our duty to raise awareness and ensure our customers are in-compliance with the legislation.

What is F-Gas regulation?

This regulation seeks to limit the emissions of the SF6, PFCs and HFCs. HFCs are used for refrigeration and air-conditioning systems and are in many organisation including both the commercial and domestic sector.

Who is the operator?

In accordance to the EU F-Gas regulation, “Operator means the natural or legal person exercising actual power over the technical functioning of the equipment and systems covered by this Regulation”. It is therefore the legal duty of the OWNER. The owner may seek to contract a maintenance contract for regular service check and at Be Cool Refrigeration we provide a complete package tailored to our client’s needs.

The operators’ responsibilities in complying with F-Gas regulation?

All operators of systems that use refrigerants containing F gases, must comply with the obligations in the EU F gas Regulation which is applicable to the system they operate as detailed below:


Contact us for Full help and more information about our support and maintenance service.

Air Conditioning Maintenance

Be Cool Refrigeration is a one stop shop for all your air conditioning needs. We provide a reliable air conditioning maintenance service in London and neighbouring areas.

Our fully qualified engineer will seek to ensure that your systems are in a fully working order for you to continue in business, whether we’ve installed your system or not.

Our services include:

  • Planned Preventative Maintenance (PPM) Contracts – Ensuring your systems operate at maximum potential
  • Repairs – In the event failure occur or any under-performance our team will inspect, advice and carryout the repair work
  • Reactive Maintenance
  • Inspection of Electric Cabling
  • Filter Cleans
  • Leak Checks
  • Drainage Checks
  • Chemical Cleans
  • Inspect of Insulation and Pipework
  • Full Service Reports – A report detailing the inspection result and advising on any potential faults.

We work with all make and models in the market and this includes:

  • Daikin
  • Mitsubishi Electric or Heavy Industries
  • Toshiba
  • Hitachi
  • Panasonic
  • LG
  • Airedale

A Man Caught Clinging on to an Air Conditioning

A man has been caught on camera clinging on to an air conditioning unit after climbing out of his lover’s apartment window to hide from her husband. So after all air conditioning is great for all kinds of reasons – for heating when you are cold, for cooling when your warm and indeed for Romeo’s hiding place.

If you want advice on which system to install for your needs give us a call, but please do not ask for advice on Romeo’s unit.